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Unread 01-21-2019, 09:25 PM   #11
Veteran DIYer- Schluterville Graduate

STAR Senior Contributor

Join Date: Jul 2004
Location: Nashua, NH
Posts: 13,934
Gypcrete can be scratched fairly easily with something like a screwdriver.

In a multi-dwelling building, that layer helps with both sound and fire resistance, so you need a similar material back down to preserve that.

It looks like there's a bunch of aggregate in that mix, which may lean more towards concrete verses gypcrete.
Jim DeBruycker
Not a pro, multiple Schluter Workshops (Schluterville and 2013 and 2014 at Schluter Headquarters), Mapei Training 2014, Laticrete Workshop 2014, Custom Building Products Workshop 2015, and Longtime Forum Participant.
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